|Another type of polymerisation reaction is known as condensation polymerisation. In such a reaction a small molecule, such as water, is given off for each monomer that attaches to the polymer chain. Most natural polymers, such as proteins and DNA, are condensation polymers.|
|Proteins, for example, are condensation polymers. The reaction that links amino acids (monomers) together is shown on the right. For every amino acid that attaches to the protein chain a water molecule is ejected. Notice how each amino acid has two functional groups, a carboxyl (COOH) and an amino (NH2).|
|Many condensation polymers are also man made. The reaction on the right shows Dacron being formed. Dacron is formed from two different monomers, ethylene glycol and terephthalic acid. A polymer formed from two different monomers is known as a copolymer. Note that each monomer has two functional groups through which the polymer, known as a polyester, can grow. This polymer is widely used in industry for the manufacture of clothing.|
Consider the compounds shown on the right.
1) Which compound can act as a monomer, when used on its own, to form a condensation polymer?
2) What small molecule will be given off as each monomer links to the chain.
3) Which two compounds can act as monomers to form a condensation polymer?
4) What small molecule is given off when these two compounds react?
5) Draw the structural formula of the polymer formed in Q4. Solution